Purpose

This paper aims to experimentally investigate the film-forming capability of base oils containing poly-methacrylate (PMA) and poly-isobutene (PIB), in a point contact under pure rolling.

Design/methodology/approach

By using the relative light intensity method, the film thickness is calculated from the interferometer images which are captured by multiple-contact optical elastohydrodynamic lubricated test rig.

Findings

The test results reveal that polymers, both PMA and PIB, have a significant contribution to the film-forming capability of base oils and the film thickness increases with concentration. The forming-film capabilities for PMA and PIB in base oils are similar at low concentration, while PIB gives a higher film thickness than PMA at high concentration. Shear-thinning phenomenon are observed in all polymer-based oils.

Originality/value

The polymer usually as an additive is added into the low viscosity base oils to improve the properties of lubricant oil. This paper reports the lubricated properties of PMA and PIB with different concentrations in base oils and to evaluate their functional mechanism in a point contact.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0263/

中文翻译：

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聚合物浓度对点接触EHL成膜的影响

目的

本文旨在通过实验研究含聚甲基丙烯酸酯（PMA）和聚异丁烯（PIB）的基础油在纯轧制下的点接触下的成膜能力。

设计/方法/方法

通过使用相对光强度方法，由干涉仪图像计算膜厚，该干涉仪图像是由多触点光学弹性流体动力润滑测试装置捕获的。

发现

测试结果表明，无论是PMA还是PIB聚合物，都对基础油的成膜能力有重要贡献，并且膜厚随浓度的增加而增加。在低浓度下，基础油中PMA和PIB的成膜能力相似，而在高浓度下，PIB的成膜能力比PMA高。在所有聚合物基油中均观察到剪切稀化现象。

创意/价值

通常将作为添加剂的聚合物添加到低粘度基础油中，以改善润滑油的性能。本文报道了不同浓度的PMA和PIB在基础油中的润滑性能，并评估了它们在点接触中的作用机理。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-07-2020-0263/